Here is the thing that makes me unable to accept the idea of partial points: it makes actually 0 sense.
How is doing damage actually worth anything in this game? The only point of damage that matters literally at all is the last one. If you have a ship at 1 health, it shoots 100% as effectively as a ship at 200 health, barring specific criticals that have no place in this discussion.
Partial points is a bad idea because it tells an inaccurate picture of what has happened. Yes, you can assume the 1 health falcon would have died in one more round, but maybe it would have tabled the opponent. It is still fully functional, it can still shoot, evade, and move just as much as always.
Maybe I've just played too much magic, but I consider the hp of my ships a resource to use freely, and if I let damage through to conserve my focus for an attack, suddenly I've been punished for this by losing points, even if the focus I saved now lets me table them on the return fire?
No solution will keep the people who game this system from gaming it, but partial points removes an interesting and powerful resource from the game and I'm not sure I have seen a good argument for it yet from anyone at all.